Females are responsible for the direct rearing of offspring in more than 95 of mammalian species (1). Humans are an intriguing exception to this pattern of paternal investment, and shifts in society and culture have led to increases in men’s involvement in the care of infants. The modern-day family comes in a variety of structures, and more and more people are playing unconventional roles in childrearing. In PNAS, Abraham et al. (2) show that fathers’ brains are malleable and can adapt to different parental roles.
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